True or False: The human body relies solely on carbohydrates for energy.

The statement that the human body relies solely on carbohydrates for energy is false. The body utilizes a variety of macronutrients for energy, including carbohydrates, fats, and proteins. Carbohydrates are indeed a primary source of energy, especially for high-intensity activities, as they can be quickly converted into glucose for immediate energy use. However, fats serve as an important energy source as well, particularly during low to moderate-intensity activities and during prolonged periods without food. Protein can also be utilized for energy, particularly when carbohydrate and fat stores are depleted, although it is generally not the body's first choice for energy due to its primary roles in building and repairing tissues. This multi-faceted approach to energy production allows the body to adapt to different activities and metabolic states, making it clear that it does not depend solely on carbohydrates.